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Exam 3: Molecules in Motion: Conformations by Rotation

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Question 21

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Which of the following has the most conformational stability?

A)
B)
C)
D)

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Question 22

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Ring-flips of cyclohexane ring chair conformations result in an inversion of stereochemistry.

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Question 23

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A Newman projection whereupon the dihedral angle between two substituents is 180° is said to be in a _______________ conformation.

Draw both chair conformations of the molecule shown below and indicate which is more stable.

Which of the following represents a Newman projection of the molecule shown below?

A cyclohexane boat conformation is more strained than the half chair conformation.

The chair conformation is the most stable conformation of cyclohexane rings.

Which of the following is a chair conformation of the structure shown below?

The boat conformation is the least stable cyclohexane conformation.

Draw the most stable stereoisomoer of 1,2,3,4,5,6-hexachlorocyclohexane in line-bond format.

The chair conformations of trans-1,3-dimethylcyclohexane are equal in energy.

A gauche confirmation leads to _______________ strain.

What is the torsional angle between the alcohol and methyl substituents shown below?

Which of the following conformations exhibits the highest torsional strain?

Which of the following Newman projections is in a gauche conformation?

What is the torsional angle between the chloro and propyl substituents shown below?

The _______________ is the highest energy cyclohexane conformation.

Which of the following best describes the bromo group in the molecule shown below?

What is the interior angle of a cyclobutane ring in its most stable conformation?

Which of the following best describes the conformation of a cyclopentane ring?